Re: [Haskell-cafe] Testing and module export lists

25 Feb 2010

      ivan.miljenovic:
...
On 24 February 2010 20:17, Magnus Therning  wrote:
...
I often find that I do want an export list to reduce clutter in the
finished code, but for testing I'd like to expose everything in a
module.  Is there a nice way to deal with this (using the C
pre-processor would not qualify as "nice" ;-)?
Maybe there's a switch that causes GHC to simply ignore the export
list of a module and export everything?
If you start a function name with an underscore, it is "implicitly
exported" by GHC (I can't find the actual documentation page at the
moment however).  Whilst it may not appear in the export list, you are
still able to call it from outside the module.
Seriously?? Doesn't that break the module system?

So this should work?

Z.hs
    module Z () where
    _secret = "10"

M.hs
    import Z
    main = print _secret

$ runhaskell M.hs
M.hs:3:14: Not in scope: `_secret'

Re: [Haskell-cafe] Testing and module export lists

Don Stewart